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rosijanka [135]
3 years ago
13

Everything on earth is made of

Chemistry
2 answers:
Helga [31]3 years ago
6 0
Everything is made out of matter. More specifically atoms.
zzz [600]3 years ago
4 0
- - Everything on earth is made of matter.Matter is all around you, everything you see and touch is matter. 
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What type of model did Rutherford, Thompson and Bohr develop?
motikmotik
The Bohr atomic model, relying on quantum mechanics, built upon the Rutherford model to explain the orbits of electrons.
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2 years ago
What is the molality of a solution of 10 g NaOH in 500 g water?<br>Molar mass NaOH = 40 g​
umka2103 [35]

Explanation:

Moles of NaOH = 10g / (40g/mol) = 0.25mol.

0.25mol / 500g = 0.50mol / 1000g = 0.50mol/dm³.

The molarity is 0.50mol/dm³.

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2 years ago
A sample of lemon juice is found to have a pH of 2.3. What is the concentration of hydrogen ions in the lemon juice?
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Answer: It's equal to 10^(-2.3), or 0.00501 M, or 5.01 * 10^-3 moles/Liter

Explanation:

Well, pH = - log[H+]

Or, in words, pH is equal to -1 multiplied by the logarithm (base 10) of the hydrogen ion concentration.   So you have 2.3 = -log[H+].    We want to isolate the H+, so let's start simplifying the right hand side of the equation. First, we multiply both sides by -1.   -2.3=log[H+]   Now, the definition of a logarithm says that if the log (base 10) of [H+] is -2.3, then 10 raised to the -2.3 power is [H+]   So on each side of the equation, we raise 10 to the power of that side of the equation.   10^(-2.3) = 10^(log[H+])   and because 10^log cancels out...   10^(-2.3) = [H+]   Now we've solved for [H+], the hydrogen ion concentration!

7 0
3 years ago
Why is copper a pure substance? a. because it is an element b. because it is a compund c. because it is a homogenous mixture
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Answer:

a. because it is an element

Explanation:

its pure because it only has one type of atom, making it an element

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Name the N-terminal and C-terminal residues for the following peptide sequence. Peptide sequence: EASY View Available Hint(s) Na
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Answer:

https://quizlet.com/199110979/biochem-chpt-5-flash-cards/

Explanation:

https://quizlet.com/199110979/biochem-chpt-5-flash-cards/

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